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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Data;
namespace Tango.Editors.Converters
{
internal class StringFormatConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
String stringValue = values[0].ToString();
String format = values[1] != null ? values[1].ToString() : null;
var resultString = Regex.Match(stringValue, @"^-?[0-9]\d*(\.\d+)?$").Value;
if (String.IsNullOrWhiteSpace(resultString)) return "";
if (resultString == "-") return resultString;
return System.Convert.ToDouble(resultString).ToString(format != null ? format : "");
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
String resultString;
if (value.ToString() == "-" || value.ToString() == ".")
{
resultString = value.ToString() + 0;
}
else
{
resultString = Regex.Match(value.ToString(), @"^-?[0-9]\d*(\.\d+)?$").Value;
}
return new object[] { System.Convert.ToDouble(String.IsNullOrWhiteSpace(resultString) ? "0" : resultString) };
}
}
}
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